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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/stdlib-1.18.2.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>STDLIB</strong><br><strong>Reference Manual</strong><br><small>Version 1.18.2</small></p>
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<!-- refpage --><center><h1>erl_eval</h1></center>
  
  <h3>MODULE</h3>
<div class="REFBODY">erl_eval</div>
  <h3>MODULE SUMMARY</h3>
<div class="REFBODY">The Erlang Meta Interpreter</div>
  <h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
    <p>This module provides an interpreter for Erlang expressions. The
      expressions are in the abstract syntax as returned by
      <span class="bold_code"><a href="erl_parse.html"><span class="code">erl_parse</span></a></span>,
      the Erlang parser, or <span class="bold_code"><a href="io.html">
      <span class="code">io</span></a></span>.</p>
  </p></div>
  <h3>DATA TYPES</h3>
    <p>
      <span class="bold_code"><a name="type-bindings">bindings()</a> = [{<span class="bold_code"><a href="#type-name">name()</a></span>, <span class="bold_code"><a href="#type-value">value()</a></span>}]</span><br></p>
    <p>
      <span class="bold_code"><a name="type-binding_struct">binding_struct()</a> = <span class="bold_code"><a href="orddict.html#type-orddict">orddict:orddict()</a></span></span><br></p>
<div class="REFBODY"><p><p>A binding structure.</p></p></div>
    <p>
      <span class="bold_code"><a name="type-expression">expression()</a> = <span class="bold_code"><a href="erl_parse.html#type-abstract_expr">erl_parse:abstract_expr()</a></span></span><br></p>
    <p>
      <span class="bold_code"><a name="type-expressions">expressions()</a> = [<span class="bold_code"><a href="erl_parse.html#type-abstract_expr">erl_parse:abstract_expr()</a></span>]</span><br></p>
<div class="REFBODY"><p><p>As returned by <span class="bold_code"><a href="erl_parse.html#parse_exprs-1">
        <span class="code">erl_parse:parse_exprs/1</span></a></span> or
        <span class="bold_code"><a href="io.html#parse_erl_exprs-2">
        <span class="code">io:parse_erl_exprs/2</span></a></span>.</p></p></div>
    <p>
      <span class="bold_code"><a name="type-expression_list">expression_list()</a> = [<span class="bold_code"><a href="#type-expression">expression()</a></span>]</span><br></p>
    <p>
      <span class="bold_code"><a name="type-func_spec">func_spec()</a> = {Module :: module(), Function :: atom()}<br>            | function()</span><br></p>
    <p>
      <span class="bold_code"><a name="type-lfun_eval_handler">lfun_eval_handler()</a> = <br>    fun((Name :: atom(),<br>         Arguments :: <span class="bold_code"><a href="#type-expression_list">expression_list()</a></span>,<br>         Bindings :: <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span>) -&gt;<br>            {value,<br>             Value :: <span class="bold_code"><a href="#type-value">value()</a></span>,<br>             NewBindings :: <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span>})</span><br></p>
    <p>
      <span class="bold_code"><a name="type-lfun_value_handler">lfun_value_handler()</a> = <br>    fun((Name :: atom(), Arguments :: [term()]) -&gt;<br>            Value :: <span class="bold_code"><a href="#type-value">value()</a></span>)</span><br></p>
    <p>
      <span class="bold_code"><a name="type-local_function_handler">local_function_handler()</a> = {value, <span class="bold_code"><a href="#type-lfun_value_handler">lfun_value_handler()</a></span>}<br>                         | {eval, <span class="bold_code"><a href="#type-lfun_eval_handler">lfun_eval_handler()</a></span>}<br>                         | none</span><br></p>
<div class="REFBODY"><p><p>Further described
        <span class="bold_code"><a href="#local_function_handler">below.</a></span></p>
      </p></div>
    <p>
      <span class="bold_code"><a name="type-name">name()</a> = term()</span><br></p>
    <p>
      <span class="bold_code"><a name="type-nlfun_handler">nlfun_handler()</a> = <br>    fun((FuncSpec :: <span class="bold_code"><a href="#type-func_spec">func_spec()</a></span>, Arguments :: [term()]) -&gt; term())</span><br></p>
    <p>
      <span class="bold_code"><a name="type-non_local_function_handler">non_local_function_handler()</a> = {value, <span class="bold_code"><a href="#type-nlfun_handler">nlfun_handler()</a></span>} | none</span><br></p>
<div class="REFBODY"><p><p>Further described
        <span class="bold_code"><a href="#non_local_function_handler">below.</a></span></p>
      </p></div>
    <p>
      <span class="bold_code"><a name="type-value">value()</a> = term()</span><br></p>
  
  <h3>EXPORTS</h3>
    <p><a name="exprs-2"></a><span class="bold_code">exprs(Expressions, Bindings) -&gt; {value, Value, NewBindings}</span><br><a name="exprs-3"></a><span class="bold_code">exprs(Expressions, Bindings, LocalFunctionHandler) -&gt;<br>         {value, Value, NewBindings}</span><br><a name="exprs-4"></a><span class="bold_code">exprs(Expressions,<br>      Bindings,<br>      LocalFunctionHandler,<br>      NonLocalFunctionHandler) -&gt;<br>         {value, Value, NewBindings}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Expressions = <span class="bold_code"><a href="#type-expressions">expressions()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Bindings = <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">LocalFunctionHandler = <span class="bold_code"><a href="#type-local_function_handler">local_function_handler()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">NonLocalFunctionHandler = <span class="bold_code"><a href="#type-non_local_function_handler">non_local_function_handler()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Value = <span class="bold_code"><a href="#type-value">value()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">NewBindings = <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Evaluates <span class="code">Expressions</span> with the set of bindings
          <span class="code">Bindings</span>, where <span class="code">Expressions</span>
          is a sequence of
          expressions (in abstract syntax) of a type which may be
          returned by <span class="bold_code"><a href="io.html#parse_erl_exprs-2">
        <span class="code">io:parse_erl_exprs/2</span></a></span>. See below for an
          explanation of how and when to use the arguments
          <span class="code">LocalFunctionHandler</span> and
          <span class="code">NonLocalFunctionHandler</span>.
          </p>
        <p>Returns <span class="code">{value, Value, NewBindings}</span>
        </p>
      </p></div>
    <p><a name="expr-2"></a><span class="bold_code">expr(Expression, Bindings) -&gt; {value, Value, NewBindings}</span><br><a name="expr-3"></a><span class="bold_code">expr(Expression, Bindings, LocalFunctionHandler) -&gt;<br>        {value, Value, NewBindings}</span><br><a name="expr-4"></a><span class="bold_code">expr(Expression,<br>     Bindings,<br>     LocalFunctionHandler,<br>     NonLocalFunctionHandler) -&gt;<br>        {value, Value, NewBindings}</span><br><a name="expr-5"></a><span class="bold_code">expr(Expression,<br>     Bindings,<br>     LocalFunctionHandler,<br>     NonLocalFunctionHandler,<br>     ReturnFormat) -&gt;<br>        {value, Value, NewBindings} | Value</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Expression = <span class="bold_code"><a href="#type-expression">expression()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Bindings = <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">LocalFunctionHandler = <span class="bold_code"><a href="#type-local_function_handler">local_function_handler()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">NonLocalFunctionHandler = <span class="bold_code"><a href="#type-non_local_function_handler">non_local_function_handler()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">ReturnFormat = none | value</span></div>
<div class="REFTYPES"><span class="bold_code">Value = <span class="bold_code"><a href="#type-value">value()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">NewBindings = <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Evaluates <span class="code">Expression</span> with the set of bindings
          <span class="code">Bindings</span>. <span class="code">Expression</span>
          is an expression in
          abstract syntax. See below for an explanation of
          how and when to use the arguments
          <span class="code">LocalFunctionHandler</span> and
          <span class="code">NonLocalFunctionHandler</span>.
          </p>
        <p>Returns <span class="code">{value, Value,
        NewBindings}</span> by default. But if the
        <span class="code">ReturnFormat</span> is <span class="code">value</span> only
        the <span class="code">Value</span> is returned.</p>
      </p></div>
    <p><a name="expr_list-2"></a><span class="bold_code">expr_list(ExpressionList, Bindings) -&gt; {ValueList, NewBindings}</span><br><a name="expr_list-3"></a><span class="bold_code">expr_list(ExpressionList, Bindings, LocalFunctionHandler) -&gt;<br>             {ValueList, NewBindings}</span><br><a name="expr_list-4"></a><span class="bold_code">expr_list(ExpressionList,<br>          Bindings,<br>          LocalFunctionHandler,<br>          NonLocalFunctionHandler) -&gt;<br>             {ValueList, NewBindings}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">ExpressionList = <span class="bold_code"><a href="#type-expression_list">expression_list()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Bindings = <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">LocalFunctionHandler = <span class="bold_code"><a href="#type-local_function_handler">local_function_handler()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">NonLocalFunctionHandler = <span class="bold_code"><a href="#type-non_local_function_handler">non_local_function_handler()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">ValueList = [<span class="bold_code"><a href="#type-value">value()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">NewBindings = <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Evaluates a list of expressions in parallel, using the same
          initial bindings for each expression. Attempts are made to
          merge the bindings returned from each evaluation.  This
          function is useful in the <span class="code">LocalFunctionHandler</span>. See below.
          </p>
        <p>Returns <span class="code">{ValueList, NewBindings}</span>.
        </p>
      </p></div>
    <p><a name="new_bindings-0"></a><span class="bold_code">new_bindings() -&gt; <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span><br></p>
<div class="REFBODY"><p>
        <p>Returns an empty binding structure.</p>
      </p></div>
    <p><a name="bindings-1"></a><span class="bold_code">bindings(BindingStruct :: <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span>) -&gt; <span class="bold_code"><a href="#type-bindings">bindings()</a></span></span><br></p>
<div class="REFBODY"><p>
        <p>Returns the list of bindings contained in the binding
          structure.</p>
      </p></div>
    <p><a name="binding-2"></a><span class="bold_code">binding(Name, BindingStruct) -&gt; {value, <span class="bold_code"><a href="#type-value">value()</a></span>} | unbound</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">BindingStruct = <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Returns the binding of <span class="code">Name</span>
          in <span class="code">BindingStruct</span>.</p>
      </p></div>
    <p><a name="add_binding-3"></a><span class="bold_code">add_binding(Name, Value, BindingStruct) -&gt; <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Value = <span class="bold_code"><a href="#type-value">value()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">BindingStruct = <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Adds the binding <span class="code">Name = Value</span>
          to <span class="code">BindingStruct</span>.
          Returns an updated binding structure.</p>
      </p></div>
    <p><a name="del_binding-2"></a><span class="bold_code">del_binding(Name, BindingStruct) -&gt; <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-name">name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">BindingStruct = <span class="bold_code"><a href="#type-binding_struct">binding_struct()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
        <p>Removes the binding of <span class="code">Name</span>
          in <span class="code">BindingStruct</span>.
          Returns an updated binding structure.</p>
      </p></div>
  

  <h3><a name="id162268">Local Function Handler</a></h3>
<div class="REFBODY">
    
    <p><a name="local_function_handler"></a>
      During evaluation of a function, no calls can be made to local
      functions. An undefined function error would be
      generated. However, the optional argument
      <span class="code">LocalFunctionHandler</span> may be used to define a function
      which is called when there is a call to a local function. The
      argument can have the following formats:</p>
    <dl>
      <dt><strong><span class="code">{value,Func}</span></strong></dt>
      <dd>
        <p>This defines a local function handler which is called with:</p>
        <div class="example"><pre>
Func(Name, Arguments)        </pre></div>
        <p><span class="code">Name</span> is the name of the local function (an atom) and
          <span class="code">Arguments</span> is a list of the <strong>evaluated</strong>
          arguments. The function handler returns the value of the
          local function. In this case, it is not possible to access
          the current bindings. To signal an error, the function
          handler just calls <span class="code">exit/1</span> with a suitable exit value.</p>
      </dd>
      <dt><strong><span class="code">{eval,Func}</span></strong></dt>
      <dd>
        <p>This defines a local function handler which is called with:</p>
        <div class="example"><pre>
Func(Name, Arguments, Bindings)        </pre></div>
        <p><span class="code">Name</span> is the name of the local function (an atom),
          <span class="code">Arguments</span> is a list of the <strong>unevaluated</strong>
          arguments, and <span class="code">Bindings</span> are the current variable
          bindings. The function handler returns:</p>
        <div class="example"><pre>
{value,Value,NewBindings}        </pre></div>
        <p><span class="code">Value</span> is the value of the local function and
          <span class="code">NewBindings</span> are the updated variable bindings. In
          this case, the function handler must itself evaluate all the
          function arguments and manage the bindings. To signal an
          error, the function handler just calls <span class="code">exit/1</span> with a
          suitable exit value.</p>
      </dd>
      <dt><strong><span class="code">none</span></strong></dt>
      <dd>
        <p>There is no local function handler.</p>
      </dd>
    </dl>
  </div>

  <h3><a name="id162402">Non-local Function Handler</a></h3>
<div class="REFBODY">
    
    <p><a name="non_local_function_handler"></a>
      The optional argument <span class="code">NonlocalFunctionHandler</span> may be
      used to define a function which is called in the following
      cases: a functional object (fun) is called; a built-in function
      is called; a function is called using the M:F syntax, where M
      and F are atoms or expressions; an operator Op/A is called
      (this is handled as a call to the function <span class="code">erlang:Op/A</span>).
      Exceptions are calls to <span class="code">erlang:apply/2,3</span>; neither of the
      function handlers will be called for such calls. 
      The argument can have the following formats:</p>
    <dl>
      <dt><strong><span class="code">{value,Func}</span></strong></dt>
      <dd>
        <p>This defines an nonlocal function handler which is called with:</p>
        <div class="example"><pre>
Func(FuncSpec, Arguments)        </pre></div>
        <p><span class="code">FuncSpec</span> is the name of the function on the form
          <span class="code">{Module,Function}</span> or a fun, and <span class="code">Arguments</span> is a
          list of the <strong>evaluated</strong> arguments. The function
          handler returns the value of the function. To
          signal an error, the function handler just calls
          <span class="code">exit/1</span> with a suitable exit value.</p>
      </dd>
      <dt><strong><span class="code">none</span></strong></dt>
      <dd>
        <p>There is no nonlocal function handler.</p>
      </dd>
    </dl>
    <div class="note">
<div class="label">Note</div>
<div class="content"><p>
      <p>For calls such as <span class="code">erlang:apply(Fun, Args)</span> or
        <span class="code">erlang:apply(Module, Function, Args)</span> the call of the
        non-local function handler corresponding to the call to
        <span class="code">erlang:apply/2,3</span> itself--<span class="code">Func({erlang, apply}, [Fun, Args])</span> or <span class="code">Func({erlang, apply}, [Module, Function, Args])</span>--will never take place. The non-local function
        handler <strong>will</strong> however be called with the evaluated
        arguments of the call to <span class="code">erlang:apply/2,3</span>: <span class="code">Func(Fun, Args)</span> or <span class="code">Func({Module, Function}, Args)</span> (assuming
        that <span class="code">{Module, Function}</span> is not <span class="code">{erlang, apply}</span>).</p>
      <p>Calls to functions defined by evaluating fun expressions
        <span class="code">"fun ... end"</span> are also hidden from non-local function
        handlers.</p> </p></div>
</div>
    <p>The nonlocal function handler argument is probably not used as
      frequently as the local function handler argument. A possible
      use is to call <span class="code">exit/1</span> on calls to functions that for some
      reason are not allowed to be called.</p>
  </div>

  <h3><a name="id162558">Bugs</a></h3>
<div class="REFBODY">
    
    <p>The evaluator is not complete. <span class="code">receive</span> cannot be
      handled properly.
      </p>
    <p>Any undocumented functions in <span class="code">erl_eval</span> should not be used.</p>
  </div>
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